The victim was taking an elevator from the 86th St./Second Ave. Q train station to street level when Turk and her 4-year-old son rushed in while people were getting out around 2:10 p.m. on Monday, police said.

"Maybe you should teach your child to wait till people come out of the elevator instead of trying to get in," the septuagenarian quipped, according to cops.

That's when Turk went ballistic, punching and slapping the older woman as her child watched, then grabbed the woman's cane and clobbered her with it, police said.

The victim wasn't seriously harmed, cops said.

Turk lives in a high-rise condo building about two blocks away from the attack, police said.